Florida employment law, how far back can an employer go on a criminal background check

I do not know of any time limit on background checks. Employers usually have contracts with the Florida Department of Law Enforcement (FDLE) to provide criminal background/history on potential employees and that is not usually limited - it could incorporate other states as well as Interpol (international) information. And when you fill out an application for employment or provide a resume, the employer may call any of those contacts you've disclosed to confirm your employment history. If another attorney knows of any limitations, I invited them to educate both of us.